Is T-mobile One Plus still available to upgrade to for a month? I did this a few years ago when traveling and want to do this again since I'll be in Turkey and Croatia for a month. But I've now discovered that the Magenta plan seems to have replaced everything else, so I'm confused if I'll be able to upgrade or not. I am currently on the T-mobile One plan, and want to downgrade back to it as soon as I'm in the US again.